hi all,i have big problem when setting my gasitaly f1 cng to my 4g92 engine.first situation on petrol i setting 9 degree btdc my engine give me a good performance.2nd situation on cng i need to set 12 degree btdc for good performance. but my engine knocking when on petrol.my setting cng 700 rpm n below running petrol, after 4200rpm run petrol for overtaking.now i setting 11 degree on cng engine running good but still have problem when have cool weather, on petrol knocking when high rpm.any suggestion to fix this problemthanks

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